/Engine/Source/Runtime/Core/Public/Logging/MessageLog.h
Notify the user with a message if there are messages present. This call will cause a flush so that the logs state is properly reflected.
void Notify ( const [FText](API\Runtime\Core\Internationalization\FText) & InMessage, [EMessageSeverity::Type](API\Runtime\Core\Logging\EMessageSeverity__Type) InSeverityFilter, bool bForce )